JPS5477168A - Electronic watch - Google Patents

Electronic watch

Info

Publication number
JPS5477168A
JPS5477168A JP14465077A JP14465077A JPS5477168A JP S5477168 A JPS5477168 A JP S5477168A JP 14465077 A JP14465077 A JP 14465077A JP 14465077 A JP14465077 A JP 14465077A JP S5477168 A JPS5477168 A JP S5477168A
Authority
JP
Japan
Prior art keywords
rotor
coil
drive pulses
detecting resistor
passage
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP14465077A
Other languages
Japanese (ja)
Other versions
JPS6318149B2 (en
Inventor
Masaharu Shida
Jun Ueda
Akira Torisawa
Shuji Otawa
Masaaki Bandai
Katsuhiko Sato
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Seiko Instruments Inc
Original Assignee
Seiko Instruments Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Seiko Instruments Inc filed Critical Seiko Instruments Inc
Priority to JP14465077A priority Critical patent/JPS5477168A/en
Publication of JPS5477168A publication Critical patent/JPS5477168A/en
Publication of JPS6318149B2 publication Critical patent/JPS6318149B2/ja
Granted legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G04—HOROLOGY
    • G04C—ELECTROMECHANICAL CLOCKS OR WATCHES
    • G04C3/00—Electromechanical clocks or watches independent of other time-pieces and in which the movement is maintained by electric means
    • G04C3/14—Electromechanical clocks or watches independent of other time-pieces and in which the movement is maintained by electric means incorporating a stepping motor
    • G04C3/143—Means to reduce power consumption by reducing pulse width or amplitude and related problems, e.g. detection of unwanted or missing step

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Control Of Stepping Motors (AREA)
  • Electromechanical Clocks (AREA)

Abstract

PURPOSE:To reduce the electric power by interruptedly connecting a high resistance detecting resistor with a closed loop including a coil so that the rotating conditions of a rotor may be detected from the voltage waveforms generated at the detecting resistor and so that normal drive pulses may be supplied while having their width stepwise shortened or enlarged. CONSTITUTION:The connecting point of a detecting resistor 30 for detecting the rotations of a rotor is connected with the input terminal of a voltage detector 40 having a preset threshold value. When coil 7 is nergized through a passage 41 by normal drive pulses, the rotor is driven. After that, interchanges are accomplished interruptedly between the condition, under which the both terminals of the coil 7 are grounded and short-circuited to the earth through a passage 42 during the mortions of the rotor, and the condition, under which a closed loop including the detecting resistor 30 is formed through a passage 43, so that the operations of the rotor are detected from the voltage waveforms which are induced in the coil. The width of the drive pulses to the step motor is stepwise shortened or enlarged in accordance with the rotations of the rotor detected so that the drive pulses of the minimum width according to the load applied can be fed to the step motor.
JP14465077A 1977-12-02 1977-12-02 Electronic watch Granted JPS5477168A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14465077A JPS5477168A (en) 1977-12-02 1977-12-02 Electronic watch

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14465077A JPS5477168A (en) 1977-12-02 1977-12-02 Electronic watch

Publications (2)

Publication Number Publication Date
JPS5477168A true JPS5477168A (en) 1979-06-20
JPS6318149B2 JPS6318149B2 (en) 1988-04-16

Family

ID=15367005

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14465077A Granted JPS5477168A (en) 1977-12-02 1977-12-02 Electronic watch

Country Status (1)

Country Link
JP (1) JPS5477168A (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006226927A (en) * 2005-02-21 2006-08-31 Seiko Instruments Inc Step motor drive unit and analog electronic timepiece
JP4800787B2 (en) * 2006-02-15 2011-10-26 セイコーインスツル株式会社 Step motor drive circuit and analog electronic timepiece

Also Published As

Publication number Publication date
JPS6318149B2 (en) 1988-04-16

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